Looks like the 1 7/8 TTIs have a flange that does not hang into the ports on the end of the cylinder head like the step header does. How much power are the TTI step headers loosing by hanging into the port?
When I was testing this 410, we tried a set of Hooker 1 3/4 headers that have a very large opening into the flange and do not hang in the port. I really expected them to make more power than the TTI's, but they did not.
The Hookers mirrored the TTI's the whole way, but never actually made more HP or TQ anywhere!
This will not be in the magazine...but it's worth noting.
Brian